1001012021220 has 48 divisors (see below), whose sum is σ = 2803207196160. Its totient is φ = 266900964096.

The previous prime is 1001012021203. The next prime is 1001012021267. The reversal of 1001012021220 is 221202101001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1001012021196 and 1001012021205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656212 + ... + 1559691.

It is an arithmetic number, because the mean of its divisors is an integer number (58400149920).

Almost surely, 2^{1001012021220} is an apocalyptic number.

1001012021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001012021220 is an abundant number, since it is smaller than the sum of its proper divisors (1802195174940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001012021220 is a wasteful number, since it uses less digits than its factorization.

1001012021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223444 (or 2223442 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001012021220 its reverse (221202101001), we get a palindrome (1222214122221).

The spelling of 1001012021220 in words is "one trillion, one billion, twelve million, twenty-one thousand, two hundred twenty".